diff --git a/Makefile.in b/Makefile.in
index e02d41fc7db..90726dd0665 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -294,7 +294,6 @@ ifdef MOZ_PSEUDO_DERECURSE
 # Interdependencies for parallel export.
 js/xpconnect/src/export: dom/bindings/export xpcom/xpidl/export
 accessible/src/xpcom/export: xpcom/xpidl/export
-js/src/export: mfbt/export
 ifdef ENABLE_CLANG_PLUGIN
 js/src/export config/export: build/clang-plugin/export
 endif
diff --git a/mfbt/Makefile.in b/mfbt/Makefile.in
deleted file mode 100644
index 6fbe8159b2d..00000000000
--- a/mfbt/Makefile.in
+++ /dev/null
@@ -1,3 +0,0 @@
-# This Source Code Form is subject to the terms of the Mozilla Public
-# License, v. 2.0. If a copy of the MPL was not distributed with this
-# file, You can obtain one at http://mozilla.org/MPL/2.0/.
diff --git a/mobile/android/fonts/Makefile.in b/mobile/android/fonts/Makefile.in
deleted file mode 100644
index 9b3e1e08ad9..00000000000
--- a/mobile/android/fonts/Makefile.in
+++ /dev/null
@@ -1,6 +0,0 @@
-# This Source Code Form is subject to the terms of the Mozilla Public
-# License, v. 2.0. If a copy of the MPL was not distributed with this
-# file, You can obtain one at http://mozilla.org/MPL/2.0/.
-
-include $(topsrcdir)/config/rules.mk
-include $(topsrcdir)/testing/testsuite-targets.mk